Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 7:The General Postprocessor (POST1) This method is not normally used, but can be useful in special circumstances. Averaging operations should not be done at nodal interfaces of differing materials. • Vector sum data: These follow the same practice as the principal stresses. By default, the vector sum magnitude (square root of the sum of the squares) at each node is calculated from averaged components. By using the AVPRIN command, you can reverse this, so that the vector sum magnitudes are first calculated per element, then averaged at the nodes. • Shell elements or layered shell elements: By default, results for shell or layered elements are assumed to be at the top surface of the shell or layer. To display results at the top, middle or bottom surface, use the SHELL command (Main Menu> General Postproc> Options for Outp). For layered elements, use the LAYER command (Main Menu> General Postproc> Options for Outp) to indicate layer number. • von Mises equivalent strains (EQV): The effective Poisson's ratio used in computing these quantities may be changed using the AVPRIN command. Command(s): AVPRIN GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Nodal Solu Main Menu> General Postproc> Plot Results> Contour Plot> Element Solu Utility Menu> Plot> Results> Contour Plot> Elem Solution Typically, you would set the effective Poisson's ratio to the input Poisson's ratio for elastic equivalent strain (item and component EPEL,EQV) and to 0.5 for inelastic strains (item and component EPPL,EQV or EPCR,EQV). For total strains (item and component EPTOT,EQV), you would typically use an effective Poisson's ratio between the input Poisson's ratio and 0.5. As an alternative, you can save the equivalent elastic strains using ETABLE with the effective Poisson's ratio equal to the input Poisson's ratio and save the equivalent plastic strains in another table using 0.5 as the effective Poisson's ratio, then combine the two table entries using SADD to obtain the total equivalent strain. • Effect of /EFACET: You may see different plots with different /EFACET settings when viewing continuous contour plots (PLNSOL). If you set /EFACET,1, the contour values for the intermediate locations are interpolated based on the average of the adjacent averaged corner node values. However, if you set /EFACET,2, the midside node values are first calculated within each element, based on the average of the adjacent unaveraged corner node values. The midside node values are then averaged together for a PLNSOL contour plot. If you issue /EFACET,4, the program uses shape functions to calculate results values at three subgrid points along each element edge. The subgrid values are first calculated within each element and are then averaged together for PLNSOL plots. Therefore, the contour values at the midside locations will differ with different /EFACET settings. In most cases, PLESOL contours will be the same regardless of /EFACET settings. However, you will see differences in PLESOL contour plots if you change /EFACET settings in conjunction with any RSYS setting other than KCN = 0. When a coordinate system other than global Cartesian is chosen (KCN = 1, 2, etc.), the results are first averaged in the global Cartesian coordinate system, and then the averaged results are transformed to the specified results coordinate system. 7.2.1.2. Deformed Shape Displays You can use these in a structural analysis to see how the structure has deformed under the applied loads. To generate a deformed shape display, use one of the following: Command(s): PLDISP GUI: Utility Menu> Plot> Results> Deformed Shape Main Menu> General Postproc> Plot Results> Deformed Shape For example, you might issue the following PLDISP command: 140 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
PLDISP,1 ! Deformed shape superimposed over undeformed shape Figure 7.6 A Sample PLDISP Plot You can change the displacement scaling by issuing the /DSCALE command (Utility Menu> PlotCtrls> Style> Displacement Scaling). Be aware that when you enter POST1, all load symbols are automatically turned off. These load symbols remain off if you subsequently re-enter the PREP7 or SOLUTION processors. If you turn the load symbols on in POST1, the resulting display will show the loads on the deformed shape. 7.2.1.3. Vector Displays Vector displays use arrows to show the variation of both the magnitude and direction of a vector quantity in the model. Examples of vector quantities are displacement (U), rotation (ROT), magnetic vector potential (A), magnetic flux density (B), thermal flux (TF), thermal gradient (TG), fluid velocity (V), principal stresses (S), etc. To produce a vector display, use one of the following: Command(s): PLVECT GUI: Main Menu> General Postproc> Plot Results> Vector Plot> Predefined Main Menu> General Postproc> Plot Results> Vector Plot> User-Defined To scale the arrow lengths, use one of the following: Command(s): /VSCALE GUI: Utility Menu> PlotCtrls> Style> Vector Arrow Scaling PLVECT,B ! Vector display of magnetic flux density Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. Notes 141
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ANSYS Mechanical APDL Basic Analysi
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Table of Contents 1. Getting Starte
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2.8.4.3. Define Material Properties
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7.2.1.6. Particle Flow and Charged
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10. Getting Started with Graphics .
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13.2.4.1.Turning Load Symbols and C
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20.8. Reviewing Contents of Binary
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List of Tables 2.1. DOF Constraints
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Chapter 1: Getting Started with ANS
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shown below define two element type
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You can choose constant, isotropic,
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You can save linear material proper
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Figure 1.4 Material Model Interface
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Figure 1.7 Data Input Dialog Box -
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The first example below is intended
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9. Click on OK. The dialog box clos
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1.1.4.9. Reading a Material Library
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If you are performing a static or f
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Chapter 2: Loading The primary obje
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Figure 2.2 Transient Load History C
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The arc-length method is an advance
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• Transferred solid loads will re
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Note If the node rotation angles th
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Figure 2.7 Scaling Temperature Cons
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Below are examples of some of the G
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Utility Menu> List> Loads> Surface>
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Figure 2.9 Example of Surface Load
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the shell, and 270° to 360° for t
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Below are examples of some of the G
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Figure 2.15 Transfers to BFK Loads
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CASE C: At least one BFV, BFA, or B
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A handy way to specify density so t
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For more information, see Initial S
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Boundary Condition Heat Flux Film C
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This problem consists of a thermal-
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2.6. Specifying Load Step Options A
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- All loads changed in later load s
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Main Menu> Preprocessor> Loads> Loa
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Command GUI Menu Paths Main Menu> S
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! Load Step 1: D, ... ! Loads SF, .
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Modeling> Create> Elements> Auto Nu
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Figure 2.22 Pretension Section Samp
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cylind,0.35,1, 0.75,1, 0,180 wpstyl
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11. Select Utility Menu> PlotCtrls>
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24. Select Utility Menu> Plot> Comp
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Chapter 3: Using the Function Tool
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Hint: A common error is a divide-by
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3.3. Using the Function Loader When
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2. Define the convection boundary c
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7. Optional: Enter comments for thi
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3.6.1. Graphing a Function From the
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Chapter 4: Initial State The term i
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Page 107 and 108: applies an equal stress of SX = 100
Page 109 and 110: 4.7.2. Example: Initial Stress Prob
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Page 113 and 114: Chapter 5: Solution In the solution
Page 115 and 116: Solver Typical Applications * In to
Page 117 and 118: used. Running the distributed spars
Page 119 and 120: With all iterative solvers, be part
Page 121 and 122: 5.3.3. Disk Space (I/O) and Postpro
Page 123 and 124: If your analysis is either static o
Page 125 and 126: Note Whether you make changes to on
Page 127 and 128: Figure 5.2 PGR File Options From th
Page 129 and 130: GUI: Main Menu> Solution> Current L
Page 131 and 132: Figure 5.3 Examples of Time-Varying
Page 133 and 134: Requirements for Performing an Anal
Page 135 and 136: *dim,temtbl,table,4,1,,time ! Defin
Page 137 and 138: 5.9.1.1.1. Multiframe Restart Limit
Page 139 and 140: prnsol finish 5.9.2. VT Accelerator
Page 141 and 142: 5.12. Stopping Solution After Matri
Page 143 and 144: Chapter 6: An Overview of Postproce
Page 145 and 146: each element. Derived data are also
Page 147 and 148: Chapter 7: The General Postprocesso
Page 149 and 150: Although not required for postproce
Page 151 and 152: The ETABLE command documentation li
Page 153 and 154: • Path plots • Reaction force d
Page 155: The PLETAB command contours data st
Page 159 and 160: 7.2.1.6. Particle Flow and Charged
Page 161 and 162: • Particle flow traces occasional
Page 163 and 164: The surfaces you create fall into t
Page 165 and 166: You can opt to archive all defined
Page 167 and 168: 19 41.811 51.777 .00000E+00 -66.760
Page 169 and 170: Sample PRETAB and SSUM Output *****
Page 171 and 172: 7.2.5. Mapping Results onto a Path
Page 173 and 174: Command(s): PDEF GUI: Main Menu> Ge
Page 175 and 176: To retrieve path information from a
Page 177 and 178: 7.2.6. Estimating Solution Error On
Page 179 and 180: Write Results - You can use the dat
Page 181 and 182: NOTE: When you append data to your
Page 183 and 184: EMF - Windows Enhanced Metafile For
Page 185 and 186: Figure 7.20 The PGR File Options Di
Page 187 and 188: 7.4.8. Comparing Nodal Solutions Fr
Page 189 and 190: the effect of the rigid body rotati
Page 191 and 192: The SADD command (Main Menu> Genera
Page 193 and 194: To view correct mid-surface results
Page 195 and 196: To get usable results combine the r
Page 197 and 198: 7.4.4. Mapping Results onto a Diffe
Page 199 and 200: • EMF (Main Menu> General Postpro
Page 201 and 202: 7.4.8.1. Matching the Nodes The Mec
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Page 205 and 206: Chapter 8: The Time-History Postpro
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enables the alternate selections sh
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1. Click on the Add Data button. Re
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APPEND Appends data to previously s
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!derivative of variable 2 with resp
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The above command assumes that you
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When plotting complex data such as
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Sample Output from EXTREM time-hist
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5. Select the variables to be opera
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RESP requires two previously define
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Chapter 9: Selecting and Components
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Note Crossover commands for selecti
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would put UX and UZ constraints on
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The Command Reference describes the
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Chapter 10: Getting Started with Gr
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Remote Network Access Hidden Line R
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10.4.1. Adjusting Input Focus To en
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• If the environment variable SB_
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10.5.5. Erasing the Current Display
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Chapter 11: General Graphics Specif
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11.3.1. Changing the Viewing Direct
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11.4. Controlling Miscellaneous Tex
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11.4.3. Controlling the Location of
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Chapter 12: PowerGraphics Two metho
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The subgrid approach affects both t
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Chapter 13: Creating Geometry Displ
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Figure 13.1 Element Plot of SOLID65
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13.2.1.12. Vector Versus Raster Mod
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Figure 13.2 Create Best Quality Ima
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13.2.3.2. Choosing a Format for the
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Chapter 14: Creating Geometric Resu
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Figure 14.2 A Typical ANSYS Results
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• Changing the contour interval.
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14.5. Isosurface Techniques Isosurf
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Chapter 15: Creating Graphs If you
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Establishing separate Y-axis scales
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15.2.3.5. Defining the TIME (or, Fo
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Chapter 16: Annotation A common ste
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16.3. 3-D Annotation 3-D text and g
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Chapter 17: Animation Animation is
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• ANMODE (Utility Menu> PlotCtrls
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Figure 17.2 The Animation Controlle
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Note If you are doing animation fro
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Chapter 18: External Graphics Besid
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18.1.4. Exporting Graphics in UNIX
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Note The commands discussed in this
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18.3.6. Editing the Neutral Graphic
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Chapter 19: The Report Generator Th
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2. Specify a caption for the captur
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19.4.1.1. Creating a Custom Table I
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Table ID 46 47 48 Description Compo
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Button or Field DYNAMIC DATA REPORT
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The HTML tag to begin JavaScript co
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listingName A unique listing name a
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Chapter 20: File Management and Fil
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20.4. Text Versus Binary Files Depe
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Identifier ELEM EMAT ERR ESAV FATG
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20.4.3. File Compression Many file
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You can also redirect graphics outp
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Chapter 21: Memory Management and C
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21.3.3. Changing Database Space Fro
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Figure 21.4 Dividing Work Space ANS
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NUM_BUFR is the number of buffers p
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een chosen for efficient running of
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Index Symbols 3-D graphics devices,
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path plots, 142 POST26 graphs, 200
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fatigue graphs, 257 files, 277 focu
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material model interface, 8 materia
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multiframe, 117 restarting an analy
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WINDOW command, 227 Windows graphic
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